[Sir Exxon]

Spoilers
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Kangaxx
You need:
-Golden Arms & Legs (kill the Lich in the Unseeing Eye-area)
-Golden Torso (kill the Lich in a house in the Bridge District)

You find him:
In the Docks District, in the house right at the end of the long stairs (the first house you come to after the Sea Bounty Tavern)

Shangalar & the Twisted Rune
You need:
-A Rogue stone (various locations)

You find him (them):
In the Bridge District, in the house right across the house where you found the guys who buried Tirdir (at the south end of the district)

He is:
Shangalar himself is a Lich, and the leader of the Twisted Rune.